# Dev Toolkit — 440+ Developer Tools

> Instant access to 440+ free developer tools. JSON, CSS, regex, color, font, API, and more. No tracking, no ads.

Canonical page: [https://chrome-stats.com/d/dev-toolkit-440-devtools](https://chrome-stats.com/d/dev-toolkit-440-devtools)

## Overview

- **ID:** `dev-toolkit-440-devtools`
- **Platform:** Firefox
- **Type:** Firefox add-on
- **Status:** Available
- **Publisher:** yurukusa
- **Category:** web-development
- **Daily users:** 1
- **Version:** 1.0.0
- **Last updated:** 2026-03-16
- **First published:** 2026-03-13
- **Size:** 43 KB
- **Data as of:** 2026-09-06
- **Store listing:** [Firefox Add-ons Store](https://addons.mozilla.org/firefox/addon/dev-toolkit-440-devtools/)

## Description

Dev Toolkit gives you instant access to 440+ free browser-based developer tools, right from your browser toolbar.

FEATURES:
- 440+ tools across 8 categories: Code, Design, Writing, Data, AI, Media, DevOps, Security
- Instant search — find any tool in milliseconds
- Favorites — star your most-used tools for quick access
- Recent tools — automatically tracks what you've used
- Category filters — browse by type
- Zero data collection — only uses storage for your favorites
- No tracking, no ads, no network requests

POPULAR TOOLS INCLUDED:
- JSON Format, JSON Diff, JSON Schema
- Regex Tester, Base64 Encoder, URL Encoder
- Color Palette, Color Contrast Checker
- CSS Grid, Flexbox, Animation generators
- Image Resize, SVG Optimizer, QR Code
- API Tester, HTTP Status Reference
- Markdown Editor, Word Counter
- And 400+ more...

Every tool is a single HTML file that runs entirely in your browser. No server, no signup, no data leaves your machine.

Open source: <a href="https://prod.outgoing.prod.webservices.mozgcp.net/v1/12dde42c029d6d1d30d9049aad7b3f0975367ef116782aae1dbb0038e1d86942/https%3A//github.com/yurukusa/dev-toolkit" rel="nofollow">https://github.com/yurukusa/dev-toolkit</a>

## Rankings

- #95,439 — Overall
- #64 — developer tools
- #126 — developer

## Permissions and access

### Permissions

- `storage`

## Safety

- **Risk impact:** Very low risk impact
- **Risk likelihood:** Moderate risk likelihood

### Analysis details

- This extension has low user count. Unpopular extensions may not be stable or safe.

> Some risk analysis details are omitted from this free response. [Upgrade to view the full analysis](https://chrome-stats.com/pricing).

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Source: [Chrome-Stats](https://chrome-stats.com/d/dev-toolkit-440-devtools)